Which would react chemically by forming a covalent bond?a. 2 neon atoms with 8 valence electrons each b. 2 hydrogen atoms with 1 valence electron each c. 1 magnesium atom with 2 valence electrons and 1 sulfur atom with 6 valence electrons d. 1 beryllium atom with 2 valence electrons and 1 argon atom with 8 valence electrons

2 hydrogen atom with  1 valence electron   each (answer B) will react forming a covalent bond.

covalent bond is a chemical bond that come  by sharing of one or more electron pair  between two atoms. when two hydrogen atoms react, they form a covalent bond by sharing electrons among themselves.

b. is the answer hoped i